1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <asm/ppc_asm.h>
3 #include <asm/asm-compat.h>
4
5 /* unsigned long xmon_mfspr(sprn, default_valu
6 _GLOBAL(xmon_mfspr)
7 LOAD_REG_ADDR(r5, .Lmfspr_table)
8 b xmon_mxspr
9
10 /* void xmon_mtspr(sprn, new_value) */
11 _GLOBAL(xmon_mtspr)
12 LOAD_REG_ADDR(r5, .Lmtspr_table)
13 b xmon_mxspr
14
15 /*
16 * r3 = sprn
17 * r4 = default or new value
18 * r5 = table base
19 */
20 xmon_mxspr:
21 /*
22 * To index into the table of mxsprs w
23 * i = (sprn & 0x3ff) * 8
24 * or using rwlinm:
25 * i = (sprn << 3) & (0x3ff << 3)
26 */
27 rlwinm r3, r3, 3, 0x3ff << 3
28 add r5, r5, r3
29 mtctr r5
30 mr r3, r4 /* put default_value in
31 bctr
32
33 .Lmfspr_table:
34 spr = 0
35 .rept 1024
36 mfspr r3, spr
37 blr
38 spr = spr + 1
39 .endr
40
41 .Lmtspr_table:
42 spr = 0
43 .rept 1024
44 mtspr spr, r4
45 blr
46 spr = spr + 1
47 .endr
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